Equilateral triangle

Find the area of an equilateral triangle with a side of 15 cm.

Correct answer:

S =  97.4279 cm2

Step-by-step explanation:

a=15 cm  a2 = (a/2)2 + h2  S = 2a h  S=43 a2=43 152=97.4279 cm2

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Tips for related online calculators
See also our right triangle calculator.
Calculation of an equilateral triangle.
See also our trigonometric triangle calculator.

You need to know the following knowledge to solve this word math problem:

We encourage you to watch this tutorial video on this math problem: video1   video2

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